A great discovery and its significance for exploration of Ordovician ultra-deep fault-controlled carbonate reservoirs in Well Manshen 1 in the Tarim Basin

doi:10.3969/j.issn.1672-7703.2020.03.002

Abstract

Abstract: Well Manshen 1, located in the Northern depression of the Tarim Basin, has achieved a great breakthrough in the Ordovician Yijianfang Formation. Based on in-depth studies of hydrocarbon accumulation conditions, reservoir characteristics, and enrichment patterns of the well, the hydrocarbon accumulation model and enrichment patterns of high-production wells in fault-controlled karst areas in the Northern depression of the Tarim Basin have been summarized. There are four types of marine carbonate rocks in the Tarim Basin: buried hill karst, interlayer karst, reef-shoal karst and fault-controlled karst. Well Manshen 1 penetrated fault-controlled karst. Well Manshen 1 is a discovery well of fault-controlled karst reservoir with the deepest burial depth and the highest single well production so far. In the Yijianfang Formation of the Ordovician, with a buried depth of 7535 m, tested oil production is 624 m3/d and gas production is 37.13×104 m3/d. Three enrichment patterns of fault-controlled karst reservoirs are established: linear strike-slip up-dip high position, transtensional lateral high position, and compressive-shear local high position. The discovery of Well Manshen 1 is a successful practical application of the exploration idea of fault-controlled karst carbonate reservoirs with faults as the core. It has achieved a breakthrough in oil and gas discovery in the saddle position between the Tabei uplift and the Tazhong bulge, which is of great significance for deep and ultra-deep oil and gas exploration in the Tarim Basin as a whole.

Key words: Tarim Basin, ultra-deep formation, fault-controlled karst, carbonate rock, Well Manshen 1

CLC Number:

Yang Haijun, Deng Xingliang, Zhang Yintao, Xie Zhou, Li Yong, Li Shiyin, Zhang Haizu, Zhu Yongfeng, Chen Yongquan. A great discovery and its significance for exploration of Ordovician ultra-deep fault-controlled carbonate reservoirs in Well Manshen 1 in the Tarim Basin[J]. China Petroleum Exploration, 2020, 25(3): 13-23.

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